If you open Disk Utility, can you see it mounted in the left column ? If so, then you might have to open Finder>Preferences>General and make sure everything is Check Marked and then under SideBar and make sure you have everything under 'Devices' Check Marked. If then it still doesn't show come back to us.

Dont forget to use the Reputation System if someone has helped you out !!!Arguing with a zealot is only slightly easier than tunneling through a mountain with your forehead!!!!!MoTM☆☆☆